poky/scripts/runqemu-ifup
Jörg Sommer d43c41fcaf runqemu-ifupdown/get-tapdevs: Add support for ip tuntap
The *ip* command supports the creation and destruction of TAP devices since
2009 and might be more likely installed on systems then *tunctl*. Therefore
it should be tried to setup or teardown the TAP interface with *ip* before
falling back to *tunctl*.

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=580fbd88f75cc9eea0d28a48c025b090eb9419a7

(From OE-Core rev: 424ede206baae1c228583aab1df6c18513ac104f)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2023-06-13 22:10:32 +01:00

3.1 KiB
Executable File

#!/bin/bash

QEMU network interface configuration script. This utility needs to

be run as root, and will use the tunctl binary from a native sysroot.

Note: many Linux distros these days still use an older version of

tunctl which does not support the group permissions option, hence

the need to use build system's version.

If you find yourself calling this script a lot, you can add the

the following to your /etc/sudoers file to be able to run this

command without entering your password each time:

ALL=NOPASSWD: /path/to/runqemu-ifup

ALL=NOPASSWD: /path/to/runqemu-ifdown

If you'd like to create a bank of tap devices at once, you should use

the runqemu-gen-tapdevs script instead. If tap devices are set up using

that script, the runqemu script will never end up calling this

script.

Copyright (c) 2006-2011 Linux Foundation

SPDX-License-Identifier: GPL-2.0-only

usage() { echo "sudo $(basename $0) " }

if [ $EUID -ne 0 ]; then echo "Error: This script (runqemu-ifup) must be run with root privileges" exit 1 fi

if [ $# -ne 3 ]; then usage exit 1 fi

USERID="-u $1" GROUP="-g $2" STAGING_BINDIR_NATIVE=$3

if taps=$(ip tuntap list 2>/dev/null); then tap_no=$(( $(echo "$taps" |sort -r |sed 's/^tap//; s/:.*//; q') + 1 )) ip tuntap add tap$tap_no mode tap group $2 && TAP=tap$tap_no fi

if [ -z $TAP ]; then TUNCTL=$STAGING_BINDIR_NATIVE/tunctl if [ ! -x "$TUNCTL" ]; then echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native" exit 1 fi

TAP=`$TUNCTL -b $GROUP 2>&1`
STATUS=$?
if [ $STATUS -ne 0 ]; then
# If tunctl -g fails, try using tunctl -u, for older host kernels
# which do not support the TUNSETGROUP ioctl
	TAP=`$TUNCTL -b $USERID 2>&1`
	STATUS=$?
	if [ $STATUS -ne 0 ]; then
		echo "tunctl failed:"
		exit 1
	fi
fi

fi

IFCONFIG=which ip 2> /dev/null if [ "x$IFCONFIG" = "x" ]; then # better than nothing... IFCONFIG=/sbin/ip fi if [ ! -x "$IFCONFIG" ]; then echo "$IFCONFIG cannot be executed" exit 1 fi

IPTABLES=which iptables 2> /dev/null if [ "x$IPTABLES" = "x" ]; then IPTABLES=/sbin/iptables fi if [ ! -x "$IPTABLES" ]; then echo "$IPTABLES cannot be executed" exit 1 fi

n=$[ (echo $TAP | sed 's/tap//' * 2) + 1 ] $IFCONFIG addr add 192.168.7.$n/32 broadcast 192.168.7.255 dev $TAP STATUS=$? if [ $STATUS -ne 0 ]; then echo "Failed to set up IP addressing on $TAP" exit 1 fi $IFCONFIG link set dev $TAP up STATUS=$? if [ $STATUS -ne 0 ]; then echo "Failed to bring up $TAP" exit 1 fi

dest=$[ (echo $TAP | sed 's/tap//' * 2) + 2 ] $IFCONFIG route add to 192.168.7.$dest dev $TAP STATUS=$? if [ $STATUS -ne 0 ]; then echo "Failed to add route to 192.168.7.$dest using $TAP" exit 1 fi

setup NAT for tap0 interface to have internet access in QEMU

$IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$n/32 $IPTABLES -A POSTROUTING -t nat -j MASQUERADE -s 192.168.7.$dest/32 echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp $IPTABLES -P FORWARD ACCEPT

echo $TAP